A plug is a short mechanical part, usually cylindrical, square or hexagonal in shape, which must guarantee perfect sealing.
Its main role is to close, seal off or protect an opening. It can be screwed, press-fitted or clipped in, depending on the type of setup and the environment in which it is used.
Bar-turned plugs are mainly used in the mechanical engineering industries and wherever precision parts are required, such as the wine-growing, gas and automotive industry markets.
Your product
We also manufacture other, more specific parts based on your specifications – come and meet us.
Have a particular product in mind? Contact us to discuss it.
JACQUEMOUX DÉCOLLETAGE, your partner for bar turning plugs
Sealing off a hydraulic circuit, closing a housing, protecting a tapped hole: a plug’s job may look simple, but it tolerates no sealing defects whatsoever. A family business specialising in bar turning, based in Marnaz (74) since 1960, JACQUEMOUX DÉCOLLETAGE produces custom turned plugs, machined from bar stock and manufactured in medium or very high-volume production.
What is a turned plug?
A plug is a short mechanical part, usually cylindrical, square or hexagonal, used to close, seal off or protect an opening. Depending on the setup, it is screwed, press-fitted or expanded into its seat, and must provide reliable, long-lasting sealing.
Bar turning makes it possible to machine the thread, sealing face, flange and drive recess (external or internal hexagon, slot) in a single part. The quality of these surfaces directly determines how well the plug withstands the pressure and fluids in the circuit.
The plugs we manufacture
We machine the main families of plugs, as well as bespoke models:
- Threaded plugs: screwed into a tapped hole, they provide secure, removable closure.
- Drain plugs: fitted to housings and tanks, they allow fluids to be drained and replaced.
- Hydraulic plugs: sized to seal off pressurised circuits.
- Flanged plugs: their collar provides a clean bearing and sealing surface against the part.
- Captive seal plugs: the seal stays attached to the plug, preventing loss and making assembly easier.
- Expansion plugs: with no thread, they seal a bore by expanding into their seat.
Your plug doesn’t fit any of these families? We will machine it from your drawing.
Brass, stainless steel, steel: which material for your plugs?
The fluid to be contained, the operating pressure and the operating environment guide the choice of material:
- Brass: a benchmark material for water and gas circuits and hydraulic applications, thanks to its machinability and corrosion resistance.
- Stainless steel: for aggressive environments and equipment subject to hygiene requirements.
- Free-cutting steel: for housing plugs and industrial hydraulic circuits, with a suitable surface treatment if required.
- Aluminium: for assemblies where low weight is a priority.
For specific needs, titanium or other special materials can be considered.
Turned plugs for a wide range of sectors
Our plugs are fitted in installations in the wine and gas industries, as well as in the automotive sector. They are also found in plumbing, heating and air-conditioning networks in the construction sector, and in the hydraulic and pneumatic circuits of machinery and equipment. JACQUEMOUX DÉCOLLETAGE also serves the energy, plastics industry, paramedical and industry and wholesale trade markets.
Custom plugs: support from design to delivery
Our team analyses your specifications to define the geometry, material and finishing suited to your circuit. Once validated at prototype or pre-production stage, we move on to medium or high-volume production.
Depending on your needs, we complement manufacturing with our additional services: industrial cleaning of parts, marking, automated inspection or, as an option, fitting the seal on captive seal plugs. Our quality system is certified ISO 9001, IATF 16949 and ISO 14001.
Have a specific plug to produce? Share your drawing and sealing requirements with us. Submit my project
